Pérouges is a commune in the Ain department in the Auvergne-Rhône-Alpes region in Eastern France. A medieval walled town perched on …Pérouges is a commune in the Ain department in the Auvergne-Rhône-Alpes region in Eastern France. A medieval walled town perched on a small hill that overlooks the plain of the river Ain, it is located 30 km northeast of Lyon, historically in the neighbouring Rhône department. In 2019, Pérouges had a population of 1,273.